If you are a smart one, you won't let your health ever take a back-seat.
While all the responsibilities in life can certainly put a damper on our energy, we still should NOT neglect our health. "Smart People" always make time to take care of themselves, whether that means going to the gym after a long work day or getting up an hour early to make a healthy breakfast before work, etc.
It can get tiring, I know..but they ("Smart People") know their health is their greatest asset. Put your health first; do whatever you need to do to improve your life!